var t = null;
t = setTimeout(time,1000);//开始执行
function time()
{
clearTimeout(t);//清除定时器
dt = new Date();
var y=dt.getYear()+1900;
var mm=dt.getMonth()+1;
var d=dt.getDate();
var weekday=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
var day=dt.getDay();
var h=dt.getHours();
var m=dt.getMinutes();
var s=dt.getSeconds();
if(h<10){h="0"+h;}
if(m<10){m="0"+m;}
if(s<10){s="0"+s;}
document.getElementById("timeShow").innerHTML =  "今天是："+y+"年"+mm+"月"+d+"日"+weekday[day]+" "+h+":"+m+":"+s+"";
t = setTimeout(time,1000); //设定定时器，循环执行           
}
